Touch screen OSP-P300S calibration

Hi
We have a OKUMA MULTUS B300 II with the touch screen PC OSP-P300S.
Now we changed the touch field. After calibrating, everything works fine, but after a reboot the calibration data is gone, and we have to calibrate it again.
Is there any write filter on the system I have to deactivate first?

hy rovivo :) i am not sure if it would work, but try to compare files / registry before and after calibration, maybe you spot the change

program files \ fcl \ rtp \ usbtab \ caltuwin.exe

it will require some hunting / kindly :)